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The solar tracking (moving in the sun's ...

The solar tracking (moving in the sun's direction) of the sunflower is called `"______"`.

A

Phototropism

B

Thigmotropism

C

Heliotropism

D

Hydrotropism

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The correct Answer is:
C
Heliotropism is a form of tropism, is a diurnal or seasonal movement of the plant parts (leaves, flowers) in response to the direction of the Sun.
Phototropism is the growth of an organism in response to a light stimulus.
Thigmotropism is a directional growth movement which occurs as a mechanosensory response to a touch stimulus.
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